depends if u want ur own server or a cheaper slot like webui or flux slot.
you can get ur own dedicated for 34pound a month from me if your not in a eu country.
or u could try a cheaper 10$ slot to start with.
look around the seedbox forum and ul see plenty.
read the reviews. :-)

yes, you can actually download the file from one site and seed it there and at several others. just download the torrents from the sites where you want to seed at, force a recheck, and voila, you are seeding instantly.
Popular TV series, PC games and HD movies do the trick. forget about music and apps.